1686387480 has 64 divisors (see below), whose sum is σ = 5195910240. Its totient is φ = 437548032.

The previous prime is 1686387473. The next prime is 1686387511. The reversal of 1686387480 is 847836861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185469 + ... + 194348.

Almost surely, 2^1686387480 is an apocalyptic number.

1686387480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1686387480 is an abundant number, since it is smaller than the sum of its proper divisors (3509522760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686387480 is a wasteful number, since it uses less digits than its factorization.

1686387480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379868 (or 379864 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The square root of 1686387480 is about 41065.6484181122. The cubic root of 1686387480 is about 1190.2890995458.

The spelling of 1686387480 in words is "one billion, six hundred eighty-six million, three hundred eighty-seven thousand, four hundred eighty".